{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "21d7500929c8a0b10e22a6755850c6f9a9280284"
            },
            {
              "fixed": "249e311c2ba392ceaf9ebfc145a46922946f069a"
            },
            {
              "fixed": "d1c4c40599c376aeb0c93068a2ae344e79ee4b90"
            },
            {
              "fixed": "2b14fe1e0924c6b901f4256456342569c5397abe"
            },
            {
              "fixed": "d766e4e5e85d829629c3ba503802fe1303d7b591"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64256.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: don't wrap around quota ids in dqiterate\n\nLOLLM noticed that q_id is an unsigned 32-bit variable.  If it happens\nto be set to XFS_DQ_ID_MAX due to a filesystem that actually has a dquot\nfor ID_MAX, then this addition will truncate to zero and the iteration\nstarts over.  Fix this by casting to u64.",
  "id": "CVE-2026-64256",
  "modified": "2026-08-18T03:31:29.145144711Z",
  "published": "2026-07-25T08:49:08.676Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/249e311c2ba392ceaf9ebfc145a46922946f069a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b14fe1e0924c6b901f4256456342569c5397abe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1c4c40599c376aeb0c93068a2ae344e79ee4b90"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d766e4e5e85d829629c3ba503802fe1303d7b591"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64256.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64256"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "xfs: don't wrap around quota ids in dqiterate"
}